CSD factors corresponded to N1 sink (peak latency 161 ms; left lateral inferior-parietal maximum; 3.0% explained variance), P2 source (220 ms; occipital maximum with lateral-parietal sinks for words, but lateral occipital-parietal maximum with a mid-parietal sink for faces; 5.0%), and P3 source (442 ms; medial-parietal maximum; 24.1%). Two high-variance factors corresponded to late activity around the time subjects responded (723 ms; centroparietal source maximum with mid-frontal sink and right lateral inferior-parietal sink; 18.1%) and beyond (1095 ms; lateral occipital-parietal sink maximum with mid-parietal and temporal sources; 39.1%). Additional low-variance factors (not included in Figure 5) clearly corresponded to P1 source (87 ms; occipital-parietal maximum; 1.2%), early N1 sink (122 ms; left lateral inferior-parietal maximum for words, but mid-occipital maximum for faces; 1.5%), and N2 sink (294 ms; mid-frontocentral maximum; 1.0%). Because factors 442 and 723 explained most of the variance within the latency range of interest (i.e., old/new effects between 300 and 800 ms), the remainder of this report is focused on these two CSD-PCA components.5
